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e taught with especial reference to their practical application; also to exhibitions of machinery and industrial products.

A Vickers-Maxim one-pounder automatic machine cannon using metallic ammunition fed from a lopped belt attached to the gun; -- popularly so called from its peculiar drumming sound in action. Sometimes, any of other similar automatic cannons.

A low, flat vessel, resembling a barge, furnished with cranes, capstans, and other machinery, used in careening ships, raising weights, drawing piles, etc., chiefly in the Mediterranean; a lighter. Pontoon bridge, a bridge formed with pontoons. -- Pontoon train, the carriages of the pontoons, and the materials they ca…

A passageway in a machine, through which a fluid, as steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face. Air port, Bridle port, etc. See under Air, Bridle, etc. -- Port bar (Naut.), a bar to secure the ports of a ship in a gale. -…

One who, or that which, potches. Potcher engine (Paper Making), a machine in which washed rags are stirred in a bleaching solution.

ich mechanical energy is exerted or mechanical work performed, as by an engine or other machine, or an animal, working continuously; as, an engine of twenty horse power.

cust, or mantis (Zoöl.), a mantis, especially Mantis religiosa. See Mantis. -- Praying machine, or Praying wheel, a wheel on which prayers are pasted by Buddhist priests, who then put the wheel in rapid revolution. Each turn in supposed to have the efficacy of an oral repetition of all the prayers on the wheel. Someti…

An apparatus or machine by which any substance or body is pressed, squeezed, stamped, or shaped, or by which an impression of a body is taken; sometimes, the place or building containing a press or presses.

One who, or that which, presses. Presser bar, or Presser wheel (Knitting machine), a bar or wheel which closes the barbs of the needles to enable the loops of the yarn to pass over them. -- Presser foot, the part of a sewing machine which rests on the cloth and presses it down upon the table of the machine.…

hemical action, and applied to produce alternation of magnetic force. (b) An engine, or machine, the object of which is to receive and modify force and motion as supplied by some natural source, and apply them to drive other machines; as a water wheel, a water- pressure engine, a steam engine, a hot-air engine, etc. (c…

lls, etc. -- Printing wheel, a wheel with letters or figures on its periphery, used in machines for paging or numbering, or in ticket-printing machines, typewriters, etc.; a type wheel.

ve body in his special privileges as such. -- Water privilege, the advantage of having machinery driven by a stream, or a place affording such advantage. [ U. S.] -- Writ of privilege (Law), a writ to deliver a privileged person from custody when arrested in a civil suit. Blackstone.

To shape the outline of an object by passing a cutter around it. Profiling machine, a jigging machine.

A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.

grooved rim, for transmitting power from, or imparting power to, the different parts of machinery, or for changing the direction of motion, by means of a belt, cord, rope, or chain.

The other mode is to pulp the coffee immediately as it comes from the tree. By a simple machine a man will pulp a bushel in a minute. B. Edwards.

An hydraulic machine, variously constructed, for raising or transferring fluids, consisting essentially of a moving piece or piston working in a hollow cylinder or other cavity, with valves properly placed for admitting or retaining the fluid as it is drawn or driven through them by the action of the piston.…

One who pumps; the instrument or machine used in pumping. Boyle.

or making holes for lacings in the ends of driving belts. -- Punch press. See Punching machine, under Punch, v. i. -- Punch pliers, pliers having a tubular, sharp-edged steel punch attached to one of the jaws, for perforating leather, paper, and the like.

A machine for fanning a room, usually a movable fanlike frame covered with canvas, and suspended from the ceiling. It is kept in motion by pulling a cord. [Hindostan] [Written also punkah.] Malcom.